Make the broth. In a medium pot, bring water to a boil over medium-high heat. Add the bouillon cube, light soy sauce, and white pepper powder. Stir until dissolved, then lower the heat and let it simmer.
Cook the wontons. Carefully drop the wontons into the simmering broth. Stir gently to prevent sticking. Cook for 4–5 minutes, or until the wontons float and are fully cooked.
Add the bok choy. Add the bok choy and cook for 1–2 minutes, just until tender and bright green.
Serve. Ladle the soup into bowls. Top with sliced green onions and a pinch of chili flakes or extra white pepper if desired.
Notes
Use the nutrition card in this recipe as a guideline.